The applicability of the numerical-graphical method for determining the ion exchange capacity described previously1 was examined for the system Sr2+−H+-polyantimonic(V) acid in 0.1–0.5M HNO3. The construction of the ion exchange isotherms by a modified McCabe—Thiele procedure is also discussed.
A numerical-graphical method is described for determining the apparent capacity of an ion exchanger for univalent and multivalent
ions, assuming that other interactions with the electrolyte, such as adsorption, precipitation, etc., are vanishingly small
in comparison with the ion exchange process.
The possible use of titanium(IV) hexacyanoferrate(II) as a cation exchanger increased the interest in the preparation of materials
with favourable ion exchange capacities and mechanical strength to be used in the columns. A new method of preparation has
been developed, which is based on the treatment of spherical particles of titanium hydroxide gel with acidic solutions of
potassium hexacyanoferrate(II). Materials of variable composition were obtained. The maximum value for the retention capacity
for cesium was found to be of 2.6 meq. Cs per gram of ion exchanger.
The paper deals with the removal of sodium from mineral acid solutions by adsorption on polyantimonic(V) acid supported on
silica gel. This material has favourable cation-exchange properties including a high mechanical stability and a suitable rate
for adsorption in column operation. The suitability of the ion-exchanger for analytical purposes, such as activation analysis
of biological samples, has been ascertained.